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35kv oil-immersed power transformer

The high-quality cold-rolled silicon steel sheet is adopted for 35KV three-phase oil-immersed power transformer, ladder three-stage seam is adopted, and the surface is coated with curing paint, which effectively reduces loss and noise; The coil is wound with high-quality oxygen-free copper conductor, the novel oil duct structure is adopted for radiation, which has reasonable design, optimizes the insulation process, and improves mechanical strength and anti-short circuit ability. It has artistic and generous outline, and is widely used in the transformer substation (station) and urban and rural power grid.

Technical parameters
External dimensions of the product
Features

Model description:

Technical parameters:

1. Rated capacity: see Table 1, Table 2 and Table 3:

2. Rated voltage: see Table 1, Table 2 and Table 3:

3. Rated frequency 50 Hz

4. Number of phases: 3 phases;

5. Cooling mode; oil-immersed natural cooling(ONAN);

6. Temperature resistance level of the insulation materials: Level A;

7. Technical performance data and coupling group number: see Table 1, Table 2 and Table 3.

Table 1 Double winding no excitation voltage adjustment distribution transformer

Rated capacity (kVA)	Voltage combination (kV)			Coupling group	No-load loss (W)	Load loss (W) (75℃)	Short-circuit impedance (%)	No-load current (%)
Rated capacity (kVA)	High-voltage (KV)	Tapping (％)	Low-voltage (KV)	Coupling group	No-load loss (W)	Load loss (W) (75℃)	Short-circuit impedance (%)	No-load current (%)
50	35 38.5	±5 ±2×2.5	0.4	Dyn11 Yyn0	160	1200/1140	6.5	1.6	1.3
100					230	2010/1910		1.4	1.1
125					270	2370/2260		1.4	1.1
160					280	2820/2680		1.3	1
200					340	3320/3160		1.2	1
250					400	3950/3760		1.1	0.95
315					480	4750/4530		1.1	0.95
400					580	5740/5470		1	0.85
500					680	6910/6580		1	0.85
630					830	7860		0.9	0.65
800					980	9400		0.8	0.65
1000					1150	11500		0.8	0.65
1250					1400	13900		0.7	0.6
1600					1690	16600		0.6	0.6

Note: for the transformer with the rated capacity of 500KV and below, the load loss above the slash in the table is only applicable for Dyn11 connection group, and the load loss value below the slash is applicable for Yyn0 connection group.

Table 2 Double winding no excitation voltage adjustment distribution transformer

Rated capacity (kVA)	Voltage combination (kV)			Coupling group	Idle load loss (W)	Load loss (W) (75℃)	Short-circuit impedance (%)	No-load current (%)
Rated capacity (kVA)	High-voltage (KV)	Tapping (％)	Low-voltage (KV)	Coupling group	Idle load loss (W)	Load loss (W) (75℃)	Short-circuit impedance (%)	No-load current (%)
800	35	±2×2.5 ±5	3.15 6.3 10.5	Yd11	980	9400	6.5	0.8	0.65
1000					1150	11500		0.8	0.65
1250					1400	13900		0.72	0.55
1600					1690	16600		0.64	0.45
2000					2170	18300		0.56	0.45
2500					2500	19600		0.48	0.45
3150	35～38.5				3040	23000	7	0.45	0.45
4000					3610	27300		0.45	0.45
5000					4320	31300		0.38	0.45
6300					5240	35000	7.5	0.38	0.45
8000		±2×2.5	3.5 3.3 6.3 6.6 10.5	YNd11	7200	38400		0.34	0.35
10000					8700	45300		0.34	0.35
12500					10000	53800	8	0.32	0.3
16000					12100	65800		0.32	0.3
20000					14400	79500		0.32	0.3

Note: for the transformer with low voltage of 10.5KV, the product with coupling group grade of Dyn11 can be provided.

Table 3 Double winding on-load-tap-changing transformer

Rated capacity (kVA)	Voltage combination (kV)			Coupling group	Idle load loss (W)	Load loss (W) (75℃)	Short-circuit impedance (%)	No-load current (%)
Rated capacity (kVA)	High-voltage (KV)	Tapping (％)	Low-voltage (KV)	Coupling group	Idle load loss (W)	Load loss (W) (75℃)	Short-circuit impedance (%)	No-load current (%)
2000	35	±3×2.5	6.3 10.5	Yd11	2300	19200	6.5	0.64	0.5
2500	35				2720	20600	6.5	0.64	0.5
3150	35～38.5				3230	24700	7	0.58	0.5
4000					3870	29100		0.58	0.5
5000					4640	34200		0.54	0.5
6300					5630	36700	8	0.54	0.5
8000			6.3 6.6 10.5	YNd11	7870	40600		0.48	0.4
10000					9280	48000		0.48	0.4
12500					10900	56800		0.45	0.35
16000					13100	70300		0.43	0.35
20000					15500	82700		0.43	0.35
25000					18300	97800	10	0.4	0.3

Note: for the transformer with low voltage of 10.5KV, the product with coupling group grade of Dyn11 can be provided.

Table 1 Double winding no excitation voltage adjustment distribution transformer

Rated capacity (kVA)	External dimensions (mm) L × W × H	Weight (kg)			Gauge (mm)
Rated capacity (kVA)	External dimensions (mm) L × W × H	Machine weight	Oil weight	Total weight	Gauge (mm)
50	1150×720×1200	230	320	680	550×550
100	1200×740×1300	380	400	980	550×550
125	1250×780×1380	440	430	1100	550×550
160	1300×800×1400	510	460	1200	660×660
200	1400×840×1500	620	500	1400	660×660
250	1530×860×1580	690	530	1500	660×660
315	1600×890×1630	820	570	1680	660×660
400	1730×950×1700	930	650	1950	660×660
500	1800×980×1800	1070	710	2300	820×820
630	1900×1000×1850	1320	830	2650	820×820
800	1950×1060×1900	1570	900	3100	820×820
1000	1980×1100×1950	1800	1080	3750	820×820
1250	2010×1160×1980	2100	1150	4050	820×820
1600	2040×1310×2000	2550	1250	4730	820×820

Table 2 Double winding no excitation voltage transformer

Rated capacity (kVA)	External dimensions (mm) L × W × H	Weight (kg)			Gauge (mm)
Rated capacity (kVA)	External dimensions (mm) L × W × H	Machine weight	Oil weight	Total weight	Gauge (mm)
800	2020×1360×2400	1510	890	3250	820×820
1000	2180×1380×2550	2060	1040	3780	1070×1070
1250	2220×1300×2520	2150	1090	3890	1070×1070
1600	2270×1340×2450	2430	1140	4450	1070×1070
2000	2250×1380×2210	2820	1420	5670	1070×1070
2500	2300×1400×2300	3330	1550	6100	1070×1070
3150	2520×2720×2550	3670	1630	7100	1070×1070
4000	2800×2250×2500	4500	1830	8250	1070×1070
5000	3000×2370×2800	5255	1900	9120	1070×1070
6300	2830×3020×2920	6650	2250	11200	1070×1070
8000	3300×2970×3050	9470	3160	15200	1475×1475
10000	3250×2850×3000	10180	3050	17000	1475×1475
12500	3500×2930×3500	11000	3660	18800	1475×1475
16000	3620×3040×3600	13650	4250	22200	1475×1475
20000	3900×3650×3540	15200	5250	26750	1475×1475

Table 3 Double winding on-load tap changer

Rated capacity (kVA)	External dimensions (mm) L × W × H	Weight (kg)			Gauge (mm)
Rated capacity (kVA)	External dimensions (mm) L × W × H	Machine weight	Oil weight	Total weight	Gauge (mm)
2000	2600×1800×2785	3100	1800	6100	1475×1475
2500	2700×1900×2970	3570	1850	7000	1475×1475
3150	3390×2170×3040	4805	2575	8850	1475×1475
4000	3100×3000×3150	4470	2320	9250	1475×1475
5000	3100×3000×3450	5550	2550	10800	1475×1475
6300	3320×3350×2980	6450	2860	12300	1475×1475
8000	3470×3130×3550	7970	3150	14720	1475×1475
10000	4596×3670×3735	10250	5275	20655	1475×1070
12500	4945×3550×3720	13385	5985	24185	1475×1475
16000	4940×3550×4457	14690	7025	27835	1475×1475
20000	4950×3945×4025	17250	7565	31325	1475×1475
25000	5100×3640×4220	20995	8530	36510	1475×1475

Note: the external dimensions shall be subject to actual dimensions of the transformer.

1. Iron core: 30Q130 high permeability silicon steel sheet is adopted. The advanced step multi-laminated mode is adopted, which effectively reduces no-load loss, no-load current and noise;

2. Winding: the oxygen-free copper conductor with high electric conductivity is adopted for the electromagnetic wire, and the new process of overall package of the cylinder type, double pie type and novel screw type is adopted for winding, so that the product structure is more compact. Main insulation can be effectively guaranteed, the first and tail layers are reinforced, and insulation property is improved. The outer surface of winding is wound with high-strength shrinkable tape, which improves mechanical strength of the winding, and greatly improves impact resistance and anti-short circuit ability of the product;

3. Body: the body insulation pad is supported with the high-strength laminated wood and laminated paper board, so that the supporting area at the winding end reached over 95%, so as to further improve product anti-short circuit ability, and improve product operation reliability. The stiff belt buffer structure is adopted for connection between the body and the box cover, so as to overcome the phenomena of 'suspension' and 'top cover'. The insulation material is wrapped with the high-strength and high-density cable paper, and the allowed pressure is 45Mpa;

4. Oil tank: the radiating pipe is adopted for the oil tank (the inserting piece is adopted for the double-row and three-row oil pipe), or the ladder finned radiator is adopted, so as to increase the heat-sinking capability in the same tank wall area; the finned radiator or corrugated tank and the forced oil air cooling or forced oil water-cooled heat sink shall also be installed according to users' requirements. Surface treatment of the oil tank: 'conformal coating' (salt fog proof, warm proof and mold proof), the adhesion force of the top coat and the primer is strong, decoration is good, the thin film oil resistance, corrosion resistance, gloss retention and color retention are good, and it has good leveling property and covering power;

5. Chosen components: the pressure relief valve, signal thermometer, gas relay and so on are installed according to standard requirements, so as to guarantee safe operation of the transformer;

6. The series products have artistic appearance and small volume, which can reduce the floor area for installation, and are the ideal maintenance-free high-quality products.

Meanwhile, we make many improvement based on traditional structure and mature technology, such as: helical winding with longitudinal oil duct, better internal radiation; effective support of the coil end surface is improved, and resistance to short-circuit current is stronger; the new lifting structure and body positioning structure are adopted, so as to guarantee more reliable long-distance transport and operation.